ORA-16002: database already open for read-write access by another instance

Cause : The database has been opened for read-write access by another instance, and cannot be opened for read-only access by this instance.

Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts

This instance must be opened for read-only access, or all other instances must first be shut down and re-opened for read-write access.

update : 23-06-2017
ORA-16002

ORA-16002 - database already open for read-write access by another instance
ORA-16002 - database already open for read-write access by another instance

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